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Alternator/ Starter Drive Gears

Triumph Thunderbird & Thunderbird Sport · Clutch & Transmission incl. Gearchange Mechanism · 22 parts · 1 on the shelf in Brea

Exploded parts diagram — Alternator/ Starter Drive Gears, Triumph Thunderbird & Thunderbird Sport

Open this diagram in the interactive viewer → Click any callout on the drawing to jump to the part.

Triumph lists this drawing for the Thunderbird Sport. Triumph builds more than one machine in this book and they do not all take the same parts. Tell us which one you ride →

Motorcycles this catalogue covers

Thunderbird & Thunderbird Sport
1999

Our parts team checks fitment against your motorcycle before any order ships.

Every part on this diagram

1
T3150129
Bolt
Qty 1
M8 x 102.5mm
$3.98
Available
2
T3550022
Washer, Hardened, M8
Qty 2
$2.93
Available
3
T1220960
Gear assembly
Qty 1
No longer supplied by Triumph
No longer available
Not on our shelf No longer availableAsk the parts desk
4
T1220281
Sleeve
Qty 1
Availability unconfirmed
$38.61
Not on our shelf Availability to confirmAsk the parts desk
5
3800019-T0301
Needle bearing
Qty 1
$63.35
Available
6
T3500201
Circlip, EXT, 23.5 x 1.2
Qty 1
$4.04
Available
7
1220330-T0301
Thrust washer
Qty 2
$1.99
Available
8
T3800011
Bearing, Ball, 254712
Qty 1
$40.57
Available
9
T1221025
Sprag and clutch assembly
Qty 1
If your engine number is 109315 or lower
$362.84
Available
9
T1221035
Sprag and clutch assembly
Qty 1
If your engine number is 109316 or higher
$362.84
Available
10
T3051063
Screw, Cap/Hd, M6 x 16, Enc, Raw
Qty 6
$1.99
Available
11
1220291-T0301
Spacer
Qty 1
No longer supplied by Triumph
No longer available
Not on our shelf No longer availableAsk the parts desk
12
T1220268
Shaft
Qty 1
* PART NO LONGER AVAILABLE *
No longer supplied by Triumph
$120.23
Not on our shelf No longer availableAsk the parts desk
13
3800020-T0301
Bearing
Qty 1
No longer supplied by Triumph
No longer available
Not on our shelf No longer availableAsk the parts desk
14
T3551283
Washer, M10, 10.5x18x1.6, Slv
Qty 2
$1.99
Available
15
T3051062
Screw, M6 x 12, Enc, Raw
Qty 2
$1.99
In stock in Brea
16
T1220247
Housing
Qty 1
$58.98
Available
17
T1220325
Rubber damper
Qty 4
* PART NO LONGER AVAILABLE *
No longer supplied by Triumph
No longer available
Not on our shelf No longer availableAsk the parts desk
18
T3150125
Bolt
Qty 1
PART NO LONGER AVAILABLE - M6 x 16mm
No longer supplied by Triumph
No longer available
Not on our shelf No longer availableAsk the parts desk
19
3550031-T0301
Belleville washer
Qty 1
$1.99
Available
20
T1220307
Centre
Qty 1
PART NO LONGER AVAILABLE
No longer supplied by Triumph
No longer available
Not on our shelf No longer availableAsk the parts desk
21
T3350112
Nut
Qty 1
$7.71
Available

Diagram and part data from Triumph’s own parts catalogue. Prices and availability are a dated snapshot, not a reservation. Fitment is Triumph’s data — send us the last six of your VIN if you want it checked before you order.

Southern California Motorcycles, 515 W Lambert Rd, Brea, CA 92821 · 714-256-6700

Triumph supply checked Oct 15, 2026.